If 30% of the girls who attended seminar on topic B are married, then find the number of girls who are unmarried from the same seminar topic.
Total number of students attended seminar on topic B = (40/100) × 500 = 200 Total number of students attended seminar on topic C = (20/100) × 500 = 100 Number of boys attended seminar on topic B = (3/5) × 200 = 120 Number of girls attended seminar on topic B = (2/5) × 200 = 80 Number of boys attended seminar on topic A = 120 - 100 = 20 Number of boys attended seminar on topic C = (1/4) × 100 = 25 Number of girls attended seminar on topic C = (3/4) × 100 = 75 Number of boys attended seminar on topic D = 150 - 90 = 60 Total number of students attended seminar on topic A = 500 – (200 + 100 + 150) = 50 Number of girls attended seminar on topic A = 50 - 20 = 30 Number of unmarried girls who attended seminar on topic B = (70/100) × 80 = 56
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